Improvement in steam-engine -slide-valves



dinard gisten @sind milling.

LettcrsPatent No. 95,591, (lated October 5, 1869.

IMPROVEMENT IN STEAM-ENGINE SLIDE-VALVES.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern z' Be it known that I, HANS KNUDSEN, of the city of North Windsor, county of' Dane, and in the State of Wisconsin, have invented a new and useful Improvement in Slide-Valves for Steam-Engines; and I do hereby declare that the following is a full, clear, andv exact description thereof, reference being had to the accompanying drawings, making part of this specification, in which- Figure l is a side elevation of a steam-engine with p my improvements attached.

Figure 2, a plan or top Viewof the same.-

Figure 3, a longitudinal section of the cylinder, showing the construction of the slide-valve, and the arrangement of the steam-passages.

Figure 4 is asimilar section.

Figure 5 is a similar view as iig. 2, the valves being removed from the boiler and cylinder. to show thearrangement ofthe ports.

Figure 6 is a bottom view4 of the cylinder slidevalve.

vFigure 7 is a longitudinal section ofthe boiler slidevalve, showing the arrangement of the ports and passages.

Figure 8 is a similar section, showing the valve in a different position.

Figure 9 is a bottom View of the boiler slide-valve.

Figure 10 is a longitudinal section ofthe same.

Corresponding letters refer to corresponding parts .in the several figures.

My invention relates to oscillating steam-engines, and may be portable and l It consists in the construction and arrangement of the valves, as hereinafter more fully described.

To enable those skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A represents the cylinder, mounted upon trunnions, through which steam is admitted, at their centres, to and exhausted from the cylinder'.

B represents' the seat of,the slide-valve, which is secured to the boiler \V, in such amanner `that its ports b and bi" are directly over two port-s in the boiler.

Its passages bi and b connect, respectively, with the pipes E and E', which lead to and connect with the trunnions of the cylinder, while its passage bii connects with the exhaust-pipe D.

C represents the boiler slide-valve, which is placed upon its seat B, and held thereto by means of a strap, C', and thumb-screws.

Its recesses c and c' are of such dimensions that each spans two apertures of' the seat; thus, in tig. 7, the recess c spans the port b and passage b, and admits steam to the cylinder through the pipe E, while the recess c spans the passages biii and bl, opening a passage for the exhaust-steam, which escapes from the cylinder, through pipe E', and, by means of the valve C, through the exhaust-pipe D.

In this position ofthe valve, the port b* is closed. The-boiler slide-valve, above described, is used as an induction and eduction-valve, and also for reversing the engine, and its operation is as follows:-

When it is in -the position shown in iig. 7 of the drawings, relatively to the ports and passages beneath, steam is admitted through thc pipe E, and exhausted through the pipe If it is now shifted to the position shown in fig. S, the exhaust-pipe becomes the induction-pipe, and thc motion of the engine is reversed.

F represents the upper partition of the cyliuder,hav' ing the ports f and j", through which the steam passes into and out of the cylinder, and the passages fii andfi", which imite in the trunnion, and connect with the pipe E, and the passage f connecting, through the opposite trunnion, with .the pipe E'.

II represents the slide-valve, which Yis placed upon and covers the ports and passages of the cylinder, and has, across. its centre, a .shaft or journal, I, the ends of which rest in bearings on the upper part of the standards supporting the cylinder.

The upper wall ot' this valve is cast hollow, thus forming a connecting passage between its ports hi, h, and hi, as shown in figs. 3 and 4.

It is provided, at its under surfaces, with recesses h and It", which, at the proper time, connect the relative ports and passages of the cylinder.

On top of this valve is placed a plate,.H", secured, by means of straps H, to the cylindeigand adjusted by means of thumb-screws, passing through the tops of the straps, and bearing upon said plate, or, to reduce friction, rollers may be made to bear upon the valve, and hold it firmly and steam-tight to the `cylinder.

By these devices, the oscillation of the cylinder' bi,- neath the valve, causes a relative change of the position ofthe two, sufficient to open and close the proper ports at the proper time.

It will be seen that by the above-described construction of the valve, steam may be admitted through the pipe E', from which it passes into the passage fi of the cylinder, and up through the ports hi of the valve, to` each end of the cylinder alternately, as communication is opened with its port. In this'evcnt, the exhaust steam passes under the recesses of the valve into the branched passage of the cylinder, and through the pipe E; or the pipe E may be used as the eduction-pipe, when the steam is admitted through the branched passage of the cylinder, and passes under the recesses of the valve alternately, to each end ot the same, aud inv this event, the exhaust steam escapes through tbe passage ofthe valve into the pipe Valve H may be employed on stationary as well as on oscillating machines.

Having thus described my invention,

What I claim, and desire to secure by Letters Pateut is- 1,. vThe arrangement of the valve H, having the journal I, the plate H, and straps H, substantially y :ts vshown and described..

2. The construction and arrangement of the valve C and its scat B, in relation to the induction and eduction-pipes E and' E', and the valve H of the cylinderrA, substantially as described.

In testimony whereof, I have signed my name to this specification, in the presence oi' two subscribing witnesses.

HANS KNUDSEN.

Witnesses: l 4

SIGN. SoRENsoN, A. FERMANN.- 

